| Budget Amount *help |
¥74,750,000 (Direct Cost: ¥57,500,000、Indirect Cost: ¥17,250,000)
Fiscal Year 2016: ¥10,010,000 (Direct Cost: ¥7,700,000、Indirect Cost: ¥2,310,000)
Fiscal Year 2015: ¥11,960,000 (Direct Cost: ¥9,200,000、Indirect Cost: ¥2,760,000)
Fiscal Year 2014: ¥11,960,000 (Direct Cost: ¥9,200,000、Indirect Cost: ¥2,760,000)
Fiscal Year 2013: ¥14,430,000 (Direct Cost: ¥11,100,000、Indirect Cost: ¥3,330,000)
Fiscal Year 2012: ¥26,390,000 (Direct Cost: ¥20,300,000、Indirect Cost: ¥6,090,000)
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| Outline of Final Research Achievements |
In various ocean provinces in the Pacific, this study worked on elucidation of the control mechanism of the primary production which drove material cycling in the ocean. The macro- and micro-nutrients limitation status of microbes and phytoplankton, especially phosphorus and iron limitation, was clarified in the Pacific. It was suggested that an increase in sea surface temperature will lead to a prevalence of the larger eukaryotic phytoplankton in the subtropical waters, probably due to the enhancement of phagotrophic mixotrophy under the warmer, more oligotrophic environments. Based on the extracted major environmental factors controlling the primary productivity in the subarctic and subtropical North Pacific, the equatorial Pacific, and the subtropical South Pacific, it was recognized that a micro-nutrient iron plays various roles in each ocean provinces, and the phosphorus cycle is a key for description of the biological production processes in the oligotrophic subtropical waters.
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